Sodium chloride is purified by passing hydrogen chloride gas in an impure solution of sodium chloride. It is based on

When $1.88 \ g$ of $AgBr_{(s)}$ is added to a $10^{-3} \ M$ aqueous solution of $KBr$,the concentration of $Ag^{+}$ is $5 \times 10^{-10} \ M$. If the same amount of $AgBr_{(s)}$ is added to a $10^{-2} \ M$ aqueous solution of $AgNO_3$,the concentration of $Br^{-}$ is

Which of the following will not have its ionization suppressed by the addition of $HCl$?

At $298 \ K$ the molar solubility of $Cd(OH)_2$ in $0.1 \ M \ KOH$ solution is $x \times 10^{-y}$. The values of $x$ and $y$ are respectively (at $298 \ K, \ K_{sp}$ of $Cd(OH)_2 = 2.5 \times 10^{-14}$)

The commercial salt is purified by passing

When $H_2S$ is passed through a solution containing $HCl$ for qualitative analysis,it does not precipitate group $IV$ cations. Why is this?